/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package javax.servlet.jsp;

/**
 * The JspEngineInfo is an abstract class that provides information on the
 * current JSP engine.
 */

public abstract class JspEngineInfo {

	/**
	 * Sole constructor. (For invocation by subclass constructors,
	 * typically implicit.)
	 */
	public JspEngineInfo() {
		// NOOP by default
	}

	/**
	 * Return the version number of the JSP specification that is supported by
	 * this JSP engine.
	 * <p>
	 * Specification version numbers that consists of positive decimal integers
	 * separated by periods ".", for example, "2.0" or "1.2.3.4.5.6.7".
	 * This allows an extensible number to be used to
	 * represent major, minor, micro, etc versions.
	 * The version number must begin with a number.
	 * </p>
	 *
	 * @return the specification version, null is returned if it is not known
	 */

	public abstract String getSpecificationVersion();
}
